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GrismTheta
-
Angle between normal to detector plane and reference ray
- Description:
- This attribute gives the angle of incidence of light of the
reference wavelength (given by attribute GrismWaveR) onto the
detector. Specifically, it holds the angle (in radians) between
the normal to the detector plane and an incident ray at the reference
wavelength. The default value is 0.0.
- Type:
- Double precision.
- Class Applicability:
-
GrismMap
-
All GrismMaps have this attribute.
Next: GrismWaveR - The reference wavelength
Up: AST Attribute Descriptions
Previous: GrismNRP - The rate of change of refractive index with wavelength
AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk
Copyright (C) 2009 Science \& Technology Facilities Council